Manufacture of inner tubes



Ap 30, 1929. P. w. LEHMAN MANUFACTURE OF INNER TUBES 5 Sheets-Sheet Filed March 28, 1927 Paul W- Lchman Invwrl-or April 30, 1929. P. w. LEHMAN MANUFACTURE OF INNER TUBES Filed March 28, 1927 3 Sheets-Sheet Paul W Lilmqn 7 lnvuwt-if-or' A 'H'orneJ April 30, 1929. w, LEHMAN I 1,711,058

MANUFACTURE OF INNER TUBES Filed March 28, 1927 5 Sheets-Sheet 3 Paul W Lehman In vawl-or %m Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

PAUL W. LEHMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOB TO THE FISK RUBBER COMPANY, OF CHICOIEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSE'ITS.

MANUFACTURE OF INNER TUBES.

Application filed March 28, 1927. Serial No. 179,060.

My invention relates to a device for stripping inner tubes from the straight pole man drels upon which they are cured. It has as an object the provision of a device which will perform this operation in an expeditious and economical manner and with a minimum handling of the mandrels. Other and further objects will be apparent from the following specification and claims.

In the accompanying drawings which illustrate one embodiment of my invention:

Figure 1 is a side elevation of the device, parts being omitted,

Figure 2 is a plan view including the structure of Figure 1.,

Figure is a front elevation of the sealing mechanism,

Figure 4 is an end elevation, partly in section of means for receiving the mandrels from the stripping conveyor,

F igure 5 is a detail view showing the sealing device in tripped position,

Figure 6 is a section, substantially on line 6-6 of Figure 3,

Figure 7 is a section substantiallyon line 77 of Figure 3,

Figure 8 is a View similar to that of Figure 7 but showing the parts in inoperative position, and

Figure 9 is a diagrammatic view showing one method of operation.

Referring to the drawings 1 and 2 indicate tables forming the support for the operating devices which comprise mandrel advancing means, generally indicated at 4, a receiving conveyor 5 and means for sealing the end of the mandrel, generally indicated at 6.

The mandrel advancing means comprise two driven rolls 7 and 8.

Roll 8 is secured to a shaft 10 journaled in bearings supported by a standard 9 secured to table 1. Shaft 10 is provided with a sprocket 11 driven by sprocket chain 12 from a motor 13 or other source of power; Roll 7 is carried bya shaft 14 journaled in a frame 15 slidably mounted on uprights 16 and 17 and adapted to be adjusted in position on said uprights, to accommodate differentsizes of mandrels, by threaded shaft 18 journaled in across-head 19 secured to uprights 16 and 17. Shaft 18 is conveniently provided with an operating hand wheel 20. Roll 7 is driven from shaftlO by a bevel gear 21 secured to the latter shaft and mes-hing with a bevel gear 22 secured to upright shaft 23, upon which is splined a bevel gear 24 carried by frame 15 and meshing with a bevel gear 25 secured to shaft 26 of roll 7. A guide and supporting roller 27 is journaled in a bracket 28 adjacent roll 8 and a similar roll 29 is journaled in frame 15 adjacent roll 7.

The receiving belt 5 is supported by pulleys 30 and 31 journaled in suitable bearings 32 and 33 supported respectively by tables 1 and 2. Pulley 30 is driven from shaft 10 by a sprocket chain 34 passing around a sprocket- 35 secured to the shaft of the pulley and a sprocket 36 secured to shaft 10.

The sealing device 6 is mounted to reciprocate n a guideway 40, supported by standards 41 on table 2 and positioned parallel with and adjacent to belt 5. As best shown in Figure 3 the sealing device comprises a cushioned plate 42 formedintegral with, or

secured to, a hub 43 secured to a shaft 44 journaled in a bearing 45 secured to a carriage 46 sliding in guide-way 40. Cushion 42 18 positioned over belt 5 as shown in Figure 3 and is releasably' locked againstforward pivotal movement by a lug 47 formed integral with a hub 48 securedto shaft 44 and adapted,

as best shown inFigure 7, to engage a lag 49 formed on a hub50 secured to arockshatt 51 journaled in bearings supported by hearing 45, see Figures Loclzinglugs 47+49 are adapted to be disengaged at al predetermined point in the travel of carriage 46 in the latter figure, by the mandrel as later described. Cushion 42 is held in the position shown in Figure 8 by means of a weight carried by an arm 60 secured to shIaftAA, and its movementis limited by a a stop member 61 secured to hub 43 and engaging shaft 51 as shown in Figure 8. A similarlstop member 62 limits the swing of cushion 42 in the oppo-,

site direction. The carriage 46 is, brought back to original position by a Weight 63 provided with a pulley 64 riding on a cable one end of which is secured to the carriage, the other end being secured to table 1.

Cushion 42 is returned to the locked position shown in Figure 7 by a pin 66 extending transversely from arm 60 and adapted, as the carriage reaches its original position, to engage cam member 67 and return arm 60 to vertical position, thereby rocking shatt 4d and bringing lug d7 again in locking engagement with lug 49.

The operation to this point is as follows: The end of a mandrel 7 0 carrying a tube 71 inserted between rolls 7 and 8 which feed the mandrel forward. The end of tube 71 is cutl'ed back 1 s at 72 (see Figure 9) and an air nozzle inserted to expand the tube and strip it from the mandrel. Since the mandrel is in the form of a cylinder open at both ends it is necessary that the forward end be sealed, after the tube has been stripped back over the rear end of the mandrel, to prevent escape of the air pressure. As the mandrel is advanced by rolls 7 and 8 the forward end of the mandrel strikes cushion 42 and forces carriage 46 forward against weight 63, the resistance being suflicient to seal the end of themandrel against the air pressure. As the stripping operation is completed arm 53 strikes trip 58 unlocking lugs 47 and 59 and the forward movement 01": the mandrel then swings cushion 42 to a horizontal position, weight 59 assuring that the cushion swings clear of the mandrel. Weight 63 then returns the carriage to initial position, pin 66 riding up cam 67 relocking the parts, as shown in Figure 7 ready for the next stripping operation.

The stripped mandrel is carried forward by belt 5 until it strikes deflector which shunts it onto inclined supports 7 6 from which it is taken by hooks 77 secured to chains 78 carried by sprockets 79 and 80. Sprockets 79 are driven from the shaft of pulley 30 through a sprocket chain 81 driving an intermediate shaft 82 provided with a bevel gear 83 meshing with bevel gear 84 secured to the end of: shaft 85 of sprockets 79. Themandrels are automatically released to hooks 77 by trips 86 carried by levers 87 pivoted at 88 and connected by links 89 to an arm 90 pivoted at 91 to the frame and provided with an extending pin 92 which is engaged by the hooks 77 to lower trips 86 and permit a man drcl to advance to the hooks then in position to receive it. The mandrels are removed from the hooks by rails 93 and received by a belt 94 which may convey them back to the tube rolling tables or to storage as desired.

It will be understood that other mandrel conveying means than that shown may be used to dispose of the mandrels as they are shunted from the stripping device.

I claim:

1. A device of the character described com prising, means for advancing a hollow cylindrical mandrel and means to seal the forward end of said mandrel during a portion at least of said advance.

2. A device of the character described com- I'nfising, means for advancing a hollow cylindrical mandrel, means in the path of said mandrel adapted to seal the forward end of the latter and to be advanced thereby, means to release the sealing means at a predetermined point and means to return the sealing means to initial position.

3. A device of the character described comprising, means for advancing a hollow cylindrical mandrel, sealing means in the path of said mandrel adapted to be engaged by the forward end of the advancing mandrel and to be advanced thereby, means exerting sealing pressure between the sealing means and the mandrel, and means positioned in the path of movement to release the sealing means to permit the latter to return to initial position.

l. A device of the character described comprising, means for advancing a hollow cylindrica-l mandrel, sealing means in the path of said mandrel adapted to be engaged by the forward end of the advancing mandrel and to be advanced thereby, means tending to re sist the advance of the sealing means to thereby apply sealing pressure between the latter and the mandrel and means positioned in the path of movement to release the sealing means to permit the latter to return to initial position under the influence of said resisting means.

5. A device of the character described comprising, means for advancing a hollow cylindrical mandrel, a pivoted sealing cushion in the path of the mandrel adapted to be engaged by the forward end of the advancing mandrel and to be advanced thereby, locking means normally holding the cushion against pivotal movement, means in the path of the mandrel advance to release the locking means, means to swing the released cushion about i ts pivot and out of the path of the mandrel, means to return the cushion to initial position and means to relock the cushion as it as sumes its initial position.

6. In a device of the character described including means for advancing a hollow cylindrical mandrel and means for sealing the forward end of the mandrel during a portion of its advance comprising a carriage provided with a horizontal shaft, a sealing cushion secured to said shaft and normally positioned to be engaged by the forward end of the advancing mandrel, a locking lug secured to said shaft and normally engaging a locking lug on a second horizontal shaft to prevent pivotal movement of the sealing cushion and to cause the latter and the carriage to be advanced by, the mandrel, a trip arm secured to the second shaft, means in the path prising, means for advancing a hollow cyl- 1 indrieal mandrel in the direction of its length and means to seal the forward end of said mandrel during a portion at least of said ad- Vance.

In testimony whereof I, have signed my 1 name to the above specification.

PAUL W. LEHMAN. 

